Re: A few filesystem benchmarks w/ReiserFS4 vs Other Filesystems

[Hans Reiser]

Alexander Lyamin wrote:

> Fri, Aug 27, 2004 at 05:45:41PM +0200, Bartlomiej Zolnierkiewicz wrote:
>  
>
> > Hi,
> >    
> >
> > > Execute rm -rf linux-2.6.8.1 on each file system.
> > > # -------------------------------------------------------------------- #
> > > ext2 | 10.26 sec @ 22% cpu
> > > ext3 | 10.02 sec @ 25% cpu
> > >  jfs | 26.67 sec @ 27% cpu
> > >  rs3 | 03.22 sec @ 74% cpu
> > >  rs4 | 25.58 sec @ 50% cpu <- What happened to reiserfs4 here?
> > >  xfs | 12.51 sec @ 47% cpu
> > > # -------------------------------------------------------------------- #
> > > Create a 500MB file with dd to each filesystem with 1MB blocks.
> > > # -------------------------------------------------------------------- #
> > > ext2 | 15.72 sec @ 26% cpu
> > > ext3 | 17.04 sec @ 31% cpu
> > >  jfs | 29.57 sec @ 25% cpu
> > >  rs3 | 15.21 sec @ 27% cpu
> > >  rs4 | 23.96 sec @ 23% cpu <- What happened to reiserfs4 here?
> > >      
Do a dd of a 50GB file, I expect a completely different result.  
Basically, this is an artifact of reiser4 choosing to flush the whole 
file once it starts to flush.

> > >  xfs | 19.07 sec @ 29% cpu
> > >      
>
> Your answers somewhere in HCH's "silent semantics" thread.
>
> Basically reiserfs team aware that they do suck at file DELETES
> and OVERWRITES.  There seem to be a way to rectify this perfomance
> issues in future (dynamic repacker?). Altough i was somewhat surprised
> with this  dd file benchmark... probably Alexander Zarochentsev knows
> the answer.
>  

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